- A
AWS Snowball Edge for offline data transfer
Why wrong: Snowball is offline and cannot achieve minimal downtime.
- B
AWS Database Migration Service (AWS DMS)
DMS supports full load and CDC replication for minimal downtime.
- C
Amazon S3 to store backup files and restore
Why wrong: S3 alone does not provide ongoing replication.
- D
AWS DataSync
Why wrong: DataSync is designed for file-based data, not databases.
Question 743 of 1,730
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company is migrating a 500 GB on-premises Oracle database to Amazon RDS for Oracle. The migration must have minimal downtime. Which AWS service should be used for the initial data load and ongoing replication?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Database Migration Service (AWS DMS)
AWS Database Migration Service (AWS DMS) is the correct choice because it supports both full-load migration of the initial 500 GB Oracle database and ongoing change data capture (CDC) replication to keep the target RDS for Oracle instance synchronized with minimal downtime. DMS uses Oracle LogMiner or binary reader to capture changes from the source redo logs and apply them continuously, enabling a near-zero downtime migration.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AWS Snowball Edge for offline data transfer
Why it's wrong here
Snowball is offline and cannot achieve minimal downtime.
- ✓
AWS Database Migration Service (AWS DMS)
Why this is correct
DMS supports full load and CDC replication for minimal downtime.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon S3 to store backup files and restore
Why it's wrong here
S3 alone does not provide ongoing replication.
- ✗
AWS DataSync
Why it's wrong here
DataSync is designed for file-based data, not databases.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS DataSync or Snowball Edge as viable for database migrations with minimal downtime, but neither supports the continuous change capture required for live replication, which is the core requirement of the question.
Detailed technical explanation
How to think about this question
Under the hood, AWS DMS for Oracle CDC leverages Oracle's supplemental logging and LogMiner to read redo logs, capturing INSERT, UPDATE, and DELETE operations in near real-time. A key subtlety is that DMS requires the source Oracle database to have ARCHIVELOG mode enabled and supplemental logging configured at the table level to ensure all changes are captured without data loss. In real-world scenarios, if the source database has high transaction volumes, DMS may fall behind if the task's maxFullLoadSubTasks or parallelApply settings are not tuned appropriately.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Deployment and Migration — study guide chapter
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS Database Migration Service (AWS DMS) — AWS Database Migration Service (AWS DMS) is the correct choice because it supports both full-load migration of the initial 500 GB Oracle database and ongoing change data capture (CDC) replication to keep the target RDS for Oracle instance synchronized with minimal downtime. DMS uses Oracle LogMiner or binary reader to capture changes from the source redo logs and apply them continuously, enabling a near-zero downtime migration.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
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